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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

Pokeweed

What is the species?

  • Phytolacca americana (pokeweed)

Pokeweed is a shrub native to the southeastern United States. It is considered edible when properly prepared but toxic to the unwary. The roots are thought to be the most toxic part of the plant but sickness can result from eating other parts, as well.

Why are we concerned?

Pokeweed is known to form dense patches that begin in disturbed urban areas (alleys, gardens) and expand into undisturbed areas. Pokeweed infestations can lead to:

  • Reduced plant and animal diversity as other plant species are displaced
  • Human health concerns

How does it spread?

Birds are thought to be key spreaders of pokeweed berries. Resting places, like fence or powerlines, are often where people will find new plants. The striking colors of pokeweed have led many homeowners to leave the first plants in place, often regretting the choice later. Pokeweed is becoming a popular species to swap among home gardeners. Pokeweed berries are moved around by:

  • Wildlife
  • Gardeners

What does it look like?

Pokeweed has thick, fleshy stems that become bright pink by mid to late summer. After three or four years, plants can be over six feet tall. Leaves are smooth-edged and spade-shaped, and can be up to 10 inches long. Clusters of small creamy-white flower form mid-summer, turning into drooping bundles of dark purple berries by early fall. The roots of young plants resemble a carrot; the roots of older plants can be two to three feet long or more.

Are there any lookalikes?

Sort of. Pokeweed’s tall, upright stems, leaf shape, and tendency to fill an area are reminiscent of knotweed. The pink color and smooth, not segmented, stems help distinguish pokeweed, with longer leaves and the drooping clusters of flowers and berries.

How do we deal with it?

  • Manual: Digging can effectively manage pokeweed, though it often needs several years of regular attention to fully eradicate. At the very least, we suggest you clip the berries and put them in the trash (not the compost). Roots should also go in the trash; that prevents any potential spread through compost. Stems, flowers and leaves CAN go in compost.
  • Herbicide: Herbicide trials have been inconclusive, but suggest that a mid- to late-summer spray be effective. Contact us directly for more information about possible herbicide options.

How can folks help?

Pokeweed is not a species the city is currently managing on private property. Private property holders are, however, strongly encouraged to manage and properly dispose of pokeweed.